<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="root">
        <h2>今天天气{{info}}</h2>
        <button @click="this.isHot=!this.isHot">切换天气</button>   <!-- @xxx='yyyy'  yyy可以写一些简单的语句 alert不行 因为vm里面没有alert -->
    </div>
    <script src="../vue.js"></script>
    <script>
        Vue.config.productionTip = false
        new Vue({
            el:"#root",
            data:{
                isHot:true
            },
            computed:
            {
                info()
                {
                    return this.isHot?'炎热':'凉爽'
                }
            },
            methods:
            {
                change(){
                    
                }
            }
        })
    </script>
</body>
</html>